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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6366c8a7f8bd7941577cf2cafa472265d6a02f9c6e08b9a4bbc39c33594f6d29' 
  AND token = 'kYrbzshrBAv54AjDUa2RjuNjcimgkm65R6QUKo9WCE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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