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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64084eb7514ec43d97945efd0bd4b8f3e512aabbb45fd4f6ac6f4fe463caf74c' 
  AND token = '1+5gdTY0gudXIxWH0eUETfyrNB7I7q92RDtj9zqXp+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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