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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ee8dbd71bc8f335707ee63104b1f3dafd5756b57cb1d0e4b8b293f2f132ae1' 
  AND token = 'hlURc5YibQydaMNyB6jTkblJS4phCUM2Y01BtgQCsLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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