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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae3375a931bacda59a8f3fd82cc206dce0383f388a9cf903e9aa08d018d27e8' 
  AND token = 'sBA4PpTXBqaoXChd+/Na8/U+75r0mPTr6pFhzWt9RWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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