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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa591c0176c22ae6a3cba7e96ba26ec2c6f10558ae966a4e3e7b8789401b236' 
  AND token = '6+jH+3ukFJhx3DoJ9fkzhcdFurM56nOeWjjZH5Z5kwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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