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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04db003360823ade68fb9755eed8a008939ba9794b7e9bd6d14b1b69fe21114e' 
  AND token = 'G8PPKM3rI9nlHWCvI/vr/Mwxo/WDrXhO95F6lnuSQUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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