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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5007124666cc00fed9c65c0c6ec6e1cdb77637c7e4207c950c6993bdb0f7ff1' 
  AND token = 'js8bj8GY8s9gkAV6LQ4daVMC3kC0prj5UUKIp/wxxSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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