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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec47cb38756d2387e06cf15932c2d32abfb69547c94e9b67fa6f69d9da64a91' 
  AND token = 'tOqGmuWNU1iYLZSgToNT51QOlvfBgiPvGja1geEgWMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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