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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369b0a6e4c9d2f77329561518d418a1b23a4ba26e90bbd4ace8ba73fa7006ffc' 
  AND token = 'vMcO3W1UzfWfv6oxi3Ldti/67JbyHM9/wHNrIp3ckSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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