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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab23b222a52c288212ea8261d51409b638f5208dc991ca90227e50eb1874d39' 
  AND token = 'sTOgbJKGXSxy++6k1MQyRa8LzwZ2/Y6raAxLnZU1pk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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