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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a399314e9e60aa22bed5d607cdfe5070689bae88bff1a14d9c1f30fd6a19557' 
  AND token = 'J6fmlGitjXcaMdS3/OBVL593a8H/PA2QLDe+iRlztqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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