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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6adbf7fdc8bc17797048ca4fab97c69663d0c950ba3cd49c751d692b9893a6dc' 
  AND token = 'IWKHuUW0DHwzDODPIZpx+BHUL48QXOOWzWuElj2nSRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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