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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207bfc866f7239a7afa5aaf461f995b2c5ca32e3cef5afdbbc182a206d78329f' 
  AND token = 'ZNRKLAib4TZsBuiMmO3je9WhKJ8RWFUYg+M2XME5kyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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