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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eff33d31de6174c72e5e5d7e2d02c0a8f161e9b455118baac27abf5c8b333b9' 
  AND token = 'MweFkgO5BHqn0ugZ+APP6s9BHEQkV3x3TACIcRVDPHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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