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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85222fa5eb3c739466ae0e3225edb9524688b7237546376ea728148f634106a' 
  AND token = 'ElAzuk4fxPrTCpL5ygDPK6VxBqig6rY0JDqXsOyUvuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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