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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3be1ce78087ea6665f121bc07a4e286da2c92466896fc2953f1d0c28effd59b' 
  AND token = 'Btl78lTDDbuoL5a7W9CJwxTYodo4VZtiukyYhxXZ56g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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