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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c58d7f0d44d78ac94b16931e6a456b3b348ee711fef1183973353f31a827675b' 
  AND token = 'JaK21aIeVWYb1xpIkU7GtW5ljuTjgvumWtZArbFWdJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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