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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b083b06ec5324b08e188e9ee49a3322f2f530494f9494e8d0f55910d565ec5af' 
  AND token = 'rP61Ldtvb05A/z4MIFSpB9hmeDE29o4idAJbWiTq0L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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