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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c6795875e965c12d7b21697b46cc81c21407d17517ffcd25536bfd85d5e7e39' 
  AND token = '8Xy93HEscuwRzHHC2mwo2oF+pk5UUBjU3elMX90r8BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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