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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f5625d2c3884ac6b578add9831e6448249c3bbbc595462b0eb60f79cd04830' 
  AND token = 'uR47CjmuJkkZQta6zpDh6uJ/ipzrR/8lKTt/zPAp9RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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