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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a8cb40cc16dd3b97a1c1d11ed1e7246a1f1ae6c6fa769cc776f0adb4120e2a6' 
  AND token = 'GdGss4RwZJCO8bPrWZQ3C2oPjQ1m1aNgjL7fK4syZL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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