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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f007adbfc6b6cd072773cd587272a25a8e2183494c20d4a598b73540499c556' 
  AND token = 'TkFOPrlNEz04/jJ7Wkbg9Moo62l3In0bynzqC5ehKA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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