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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '645755941ade81c8f332942a8553acf27e059b78ecbcfe2b596143d424b5d29b' 
  AND token = 'PB4enI7+4YDosLibQVyaSWkWfkie9Z7FKlbEzJHc310=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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