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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82db27e8db3dcc131b14d305369c02f979a469d1141291d01d7506034fad0259' 
  AND token = 'bV68SLGDooy7r3sF6qVocRPRXINXe8V7FW1NwM+dVj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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