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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d505b612259733b6512e73522f56faf18801d09f5e6bcf6c7f603fef7e6f0c6' 
  AND token = '6UgFftFYTr0jmMe8802mZ9IyNfMLmPL6KdGiKKVN2u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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