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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cde2fe9ac7acb5dc5ab265c9cee6f349cf390a26b0f7a7fa247393de8fa009a' 
  AND token = 'EGnu7S3sdRgsp58uptNr8Oa9WOnnLSELdw4oUd/WMH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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