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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccaa99bfc0a2637e8f1c8ca191fb42eb6219f0ee9aab4d27119227bcbee5963c' 
  AND token = 'uidRNjRgxhtil8TUWfMpU7GQcgFf4JTKHu/QNCHQ4Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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