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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a85929342b67a858c27e390a3e8c03c83b6845a768fc96fc1928e80566e70f' 
  AND token = 'pTXtkQr2T0IED2aVLpyHwfycDnIVO5fxLtWrPyLBexo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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