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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36d944e8897ea00a23dc7e38574031ab3db9df048ccdab7c18fe46a46062eb0' 
  AND token = 'mAAXh+jV0c8nS2jbS5VdSz1wStd3CTnIvtLlcnOvxVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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