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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4641ad1b7737ff06f6f3a62a0849bc674c88a9fc6b3d9073a254eebfb2ccdd1' 
  AND token = 'Ph2SCh+cqp7tsyRGEbTXnzbb0j/4HH2420rwRLMf92U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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