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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01bc71bb57c4b95f7402be50aa08a137da715969c3177384facd8bef5df82b86' 
  AND token = 'uZwpOHZg1l7QJkvKnnaQyFybTNBldI9NC9awyonp4j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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