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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e67565b3b28b9c2e43a5d420c7058ee4f0a94cff4635a9904865f59b5964a5' 
  AND token = 'yPhIKe7GErOlALOh1Wke5ieOw363Lzh3ON9g9euVVb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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