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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '742029fef99b1c55b2facf25c5d273f2db2d3581e4c54fce8e705f713e7afc7c' 
  AND token = '7ugsxIMN2WKUKIm6OXK1pCZxLND48IksR7TYzhREz3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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