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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2778f99a5850c48e826544d64821c576be48627f0ccb48a45fef72c7f4d16a54' 
  AND token = 'xk3wXm4eC0WGw9l0da6bYie17d02DNe4OKQHGKCBiXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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