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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174cf3ce0dcd0105de1b0434eae125a53daa2af0cee918c1f08d875aa1a819dd' 
  AND token = '8XNnGt22wpFqRdtUiCxcqxgdBOpX6OOIOp/uW5GfxKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00233

JSON explain

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