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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2677bb47d10b0919a19bccca2bafe13f660f7f61d592acf5cc1bfe384e75f6a7' 
  AND token = '37L9heOJfZH83Sf9F15jhenNxv8hZnzBX5+iPwHy0RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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