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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36de883788484a0ad052746df0c207271731b3ab7dc65b43a93139b8844c5b9' 
  AND token = 'UoIQQHTz0x0RpT1miVSn6P+3IF11dE4n/q0q0dmis2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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