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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c3ac1fd5590c50bc330d38b4abe8df7dd5bfbc21f1a801f3604a2f15d1de076' 
  AND token = 'QwY26OIetiSzN+vD3WuV5naq/xJV8f54MYy1TnC2CJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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