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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940e02ef072023ac88e5fc6fdf96c7d03dfef7cd9c3bb08899803b0bca35a01c' 
  AND token = 'MkLji3OtZgXqYOZ8k3CnDH/nWFvvje4A3NR5aicGPWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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