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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8de330e7858e1c209ae2d737856b323d2510377105afac6e266dadd8b0ad08' 
  AND token = 'EnNZK3Lr8Rx40YOcrViQuM1dbxToXq5wyn+9zilIVZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00125

JSON explain

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