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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2800365997491bbf99b6590ef10d7ee3df7ae44fc92b336666a31a3f494d12' 
  AND token = 'RXVee5krRiU6TYeZnjGvET0GCL6tpUj6ih/qbY6zr0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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