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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa7b74b8c78e1e4eb9e92aa8d1ca6630a22a881115c585b6fab6fabb9e2c422' 
  AND token = '2LxAUMX7Jv4MvBhfpjMIgDQKO6f8zOet36iyJ5ofKAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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