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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff979fd9ee988fa6a1019d43edb674e4685ecfb7dc6b59cd8dd7c035ea960ab' 
  AND token = 'hR+7gYegzUoAlXJonvTxSvn2qSXIoIcs3L8gf6CywFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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