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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '061cdcee8181bdbd9e867a49f89cf9edc45147344f93778d5b4ef9bc1b2eeddc' 
  AND token = 'PeAW/2/Ib0ofg6ZE0v+xelbRdDdbrux/Q9iP3cP9UJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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