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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99321fe3780b070d170d8f58115b5e1d752f38bf9d9fb4cabf6bb9a965956898' 
  AND token = 'X4huTnjL2fWbZZqQJsEGBsfO1RBd253nY+Qy68LSt7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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