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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c631ba84151055cb7b86041f7471264e1ff325dcb3a9add40f58bfa42e35b8ca' 
  AND token = 'jSVvPFkKvEznen5/8k9OBmAsiNtuTzrAS1gg4FoMQ5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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