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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c7a308adc249e05acfd308caf7ab3c7fa210d7f48171248f6acd59ba978a795' 
  AND token = 'tgK1naKqZNs2H1PaYgE2hJrCZl12Rt9HIYL48ZtUo3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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