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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb4a74e7a983d12c5536810ef65e5331f0c0ea5f016f7abe14be424723928422' 
  AND token = 'DScPmrwLEhC4SpyZIIAwH1FKZ1D3TG3t5PnmWQEvadY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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