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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f20667f051bb7805bef60052ecf63ab6521ac7c13ce9825d921d031c2821bff' 
  AND token = '93J0tmf8UV4MTyFTUZb5unqdTyyh0zhubSWB2DYacf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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