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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1114731af2dc6073a2716bffd108633a31cb4ae8a69ed5e6a617d6c32f001a' 
  AND token = '2NIttMX3j97S0jidTYL/G2WuX2y3cnx4D5eAQlSAGfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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