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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906a9732993ed6dfce71f680164e21c5fbd28981a997836a199bd2c0c3c7de38' 
  AND token = 'KWwdEDWmzfQjI49JQeOhnALiqLiSUr7axyIsU3csKlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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