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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e108b65f3c4f26c1d5c4f4166a16f6b34afcf1495aff647b8a0b87a9489f066d' 
  AND token = 'FBANMUgTQ5PexLoJKgl3ewga6vgj6D8FV0j230Ig7Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}