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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96622b8e9170d4cc9335a69870d56efd4fd04022ca576700522b5d87746070d6' 
  AND token = '/16WQ+VsAem+v86roCjIRKfEWY6dO8VfsFhieXZg0rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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